Re: Workaround: Mails to gmail bouncing

[Wietse Venema]

Wietse Venema:
> Ralf Hildebrandt:
> > Jun 19 09:52:43 mail-cvk postfix/smtp[32063]: 45THH93PXyz1Z4Kq: 
> > to=<malgorzata.ixxx...@gmail.com>, 
> > relay=gmail-smtp-in.l.google.COM[173.194.76.26]:25, delay=4.8, 
> > delays=3.3/0.04/0.62/0.84, dsn=5.5.0, status=bounced (Protocol error: host 
> > gmail-smtp-in.l.google.COM[173.194.76.26] said: 250 2.1.5 OK 
> > w9si551343wmd.47 - gsmtp (in reply to DATA command))
> 

Additional workaround: do not reuse a session after protocol error.
Once a session is messed up, all subsequent reuses would fail too.

        Wietse

--- /var/tmp/postfix-3.5-20190615/src/smtp/smtp_trouble.c       2017-12-27 
17:29:45.000000000 -0500
+++ src/smtp/smtp_trouble.c     2019-06-19 10:10:20.000000000 -0400
@@ -317,6 +317,8 @@
      */
     VSTRING_RESET(why->reason);
     if (mta_name && status && status[0] != '4' && status[0] != '5') {
+       SMTP_SESSION *session = state->session;
+       DONT_CACHE_THIS_SESSION;
        vstring_strcpy(why->reason, "Protocol error: ");
        status = "5.5.0";
     }